Question 186Refrigeration/AC - Assistant Engineer70% to pass
In the multi-evaporator refrigeration system shown in the illustration, what is the proper name for the valve labeled "29"? Illustration GS-RA-12
AI Explanation
The correct answer is B) chill box thermostatic expansion valve.
The valve labeled "29" in the illustration is a thermostatic expansion valve, which is responsible for regulating the flow of refrigerant into the chill box evaporator. This valve maintains the proper superheat at the evaporator outlet, ensuring efficient operation of the refrigeration system.
The other options are incorrect because a chill box solenoid valve (A) is a different type of valve used for on/off control, a freeze box thermostatic expansion valve (C) would be used in the freezer section, and a chill box evaporator pressure regulating valve (D) is a different component that maintains a specific pressure in the chill box evaporator.
Related Questions
#184 Constant superheat is maintained at the evaporator coil outlet of a refrigeration system or unit by the action of what device? #185 Concerning the proper installation of the sensing bulb of a thermal expansion valve that is attached to the evaporator tail coil on a horizontal run, what statement is true? #187 In refrigeration systems with multiple evaporators, the metering of refrigerant to each refrigerated space evaporator is accomplished by what device? #188 An air-cooled refrigerated container unit using R-134a as a refrigerant has a box temperature set point of -15°F, but it is currently operating with a stable return air temperature of 0°F. The fresh air makeup vent is closed, the unit is operating at 460 VAC/60 Hz, and the unit is in full capacity cool (modulating valve 100% open). Using the illustrated troubleshooting guide, what would be the normal range of expected discharge pressures if the ambient air temperature is 90°F? Illustration GS-RA-52 #189 Which of the conditions listed could cause excessively low refrigerant pressure at the compressor suction of a TXV controlled refrigeration system?